Geologic time started 4.6 billion years ago with the formation of the Earth. As time progressed the surface of the molten planet cooled, oceans formed, and life arose. These events left a mark on the land which can be glimpsed through the rock and fossil records.

Geologic time started 4.6 billion years ago with the formation of the Earth. As time progressed the surface of the molten planet cooled, oceans formed, and life arose. These events left a mark on the land which can be glimpsed through the rock and fossil records.

Geologic time started 4.6 billion years ago with the formation of the Earth. As time progressed the surface of the molten planet cooled, oceans formed, and life arose. These events left a mark on the land which can be glimpsed through the rock and fossil records.

Geologic time started 4.6 billion years ago with the formation of the Earth. As time progressed the surface of the molten planet cooled, oceans formed, and life arose. These events left a mark on the land which can be glimpsed through the rock and fossil records.